Features: Ergonomic design; Easy to use; Reliable; Only 1-3 seconds duration for sealing; Easy access for tube insertion; Can be sealed tube from 2.5mm to 6mm; Low hemolysis technology; High precision optical start switch; Easy to clean; Detachable sealing head cover, allowing easy cleaning of the sealing electrodes; High efficiency and small power consumption for battery operated devices and short sealing time; Easy or no field adjustment, parts change, ease of maintenance; Small head for transparency of the sealing process.